As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB EICAS E/E LIGHT ILLUMINATED, CABIN CONTINUED SLIGHT CLIMB. PERFORMED AIR TURNBACK. PLACARD THE LOWER LOBE ELECTRONIC EQUIPMENT ACCESS DOOR ITEM DEFERRED PER MEL 52-71-1 ITEM IS A CATEGORY C. ADDITIONALLY PERFORMED CABIN PRESSURE CONTROL BITE CHECK, NO DEFECTS NOTED.